package accountManagement.servlet;


import java.io.IOException;
import java.security.InvalidParameterException;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import accountManagement.Account;
import accountManagement.AccountManager;

/**
 * Servlet implementation class Login
 */
@WebServlet("/ServletLogin")
public class ServletLogin extends HttpServlet {
	private static final long serialVersionUID = 1L;
       
    /**
     * @see HttpServlet#HttpServlet()
     */
    public ServletLogin() {
        super();
    }

	/**
	 * @see HttpServlet#doGet(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		doService(request, response);
	}

	/**
	 * @see HttpServlet#doPost(HttpServletRequest request, HttpServletResponse response)
	 */
	protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
		doService(request, response);
	}

    private void doService(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
    	try {
    		Object user = request.getSession().getAttribute("user");
        	if(user != null) {
        		throw new InvalidParameterException("Non disponi dei privilegi necessari per accedere alla pagina richiesta");
        	}
			//Prelievo dei dati
			String nickname = request.getParameter("nickname");
			String password = request.getParameter("password");
			
			// Elaborazione dei dati e creazione della risposta
			AccountManager manager = AccountManager.getInstance();
			Account result = manager.checkLogin(nickname, password);
			
			String esito;
			if(result == null) {
				esito = "Login non riuscito: credenziali non valide";
			} else {
				esito = "Login riuscito";
				request.getSession().setAttribute("user", result);
			}
			request.setAttribute("resultTitle", "Login");
			request.setAttribute("resultContent", esito);
			request.getRequestDispatcher("/result.jsp").forward(request, response);
		} catch(InvalidParameterException | NullPointerException e) {
			request.setAttribute("error", e.getMessage());
    		request.getRequestDispatcher("/errorPage.jsp").forward(request, response);
		}
    }
}
